His penis is sooooo gigantic, it's not only causing problems on the set of Mad Men, but also in the show's advertising!

As we all know, Jon's hammbone has been on display in the past so we ALL know what kind of heat he's packing.

But, apparently, his giant peen has been a concern for the show's costume designers since the clothes of '60s tend to be a little, erm, tighter so they've had to ask him to wear underwear while shooting his scenes.

Oh, but that's not all!

According to sources, his crotch area has even had to be digitally altered for billboards and bus ads because his it can clearly be seen in pictures.

An on-set source said:

"Imagine how distracting that would be on the side of a bus or building when the promotional pictures came back the first few seasons, we had to work with them. Everyone was concerned about too much Christina Hendricks boob, but it’s Jon that has the most to show. It’s a good problem to have."

It's practically bursting out of his pants on set (above)!!! Is it breaking through the seams?!?!?

Hey, no complaints here! We enjoy thinking about Dick Whitman's d–k! …So much so that we've even provided a few crotch shots of the hammbone (below)!

Now, let's play the game "Is there a banana in his pocket or is he happy to see us?"